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14f44bd9c9
shadow/src/userdel.c
nekral-guest 14f44bd9c9 * NEWS, src/userdel.c: Check the existence of the user's mail 
spool before trying to remove it. If it does not exist, a warning
	is issued, but no failure.
2011-06-04 22:38:57 +00:00

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/*
* Copyright (c) 1991 - 1994, Julianne Frances Haugh
* Copyright (c) 1996 - 2000, Marek Michałkiewicz
* Copyright (c) 2000 - 2006, Tomasz Kłoczko
* Copyright (c) 2007 - 2011, Nicolas François
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. The name of the copyright holders or contributors may not be used to
* endorse or promote products derived from this software without
* specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
* PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include <config.h>
#ident "$Id$"
#include <errno.h>
#include <fcntl.h>
#include <getopt.h>
#include <grp.h>
#include <pwd.h>
#include <stdio.h>
#include <stdio.h>
#include <sys/stat.h>
#include <sys/stat.h>
#ifdef ACCT_TOOLS_SETUID
#ifdef USE_PAM
#include "pam_defs.h"
#endif /* USE_PAM */
#endif /* ACCT_TOOLS_SETUID */
#include "defines.h"
#include "getdef.h"
#include "groupio.h"
#include "nscd.h"
#include "prototypes.h"
#include "pwauth.h"
#include "pwio.h"
#include "shadowio.h"
#ifdef SHADOWGRP
#include "sgroupio.h"
#endif /* SHADOWGRP */
#ifdef WITH_TCB
#include <tcb.h>
#include "tcbfuncs.h"
#endif /* WITH_TCB */
/*@-exitarg@*/
#include "exitcodes.h"
/*
* exit status values
*/
#define E_PW_UPDATE 1 /* can't update password file */
#define E_NOTFOUND 6 /* specified user doesn't exist */
#define E_USER_BUSY 8 /* user currently logged in */
#define E_GRP_UPDATE 10 /* can't update group file */
#define E_HOMEDIR 12 /* can't remove home directory */
/*
* Global variables
*/
const char *Prog;
static char *user_name;
static uid_t user_id;
static char *user_home;
static bool fflg = false;
static bool rflg = false;
static bool is_shadow_pwd;
#ifdef SHADOWGRP
static bool is_shadow_grp;
static bool sgr_locked = false;
#endif /* SHADOWGRP */
static bool pw_locked = false;
static bool gr_locked = false;
static bool spw_locked = false;
/* local function prototypes */
static void usage (int status);
static void update_groups (void);
static void close_files (void);
static void fail_exit (int);
static void open_files (void);
static void update_user (void);
static void user_cancel (const char *);
#ifdef EXTRA_CHECK_HOME_DIR
static bool path_prefix (const char *, const char *);
#endif /* EXTRA_CHECK_HOME_DIR */
static int is_owner (uid_t, const char *);
static int remove_mailbox (void);
#ifdef WITH_TCB
static int remove_tcbdir (const char *user_name, uid_t user_id);
#endif /* WITH_TCB */
/*
* usage - display usage message and exit
*/
static void usage (int status)
{
fputs (_("Usage: userdel [options] LOGIN\n"
"\n"
"Options:\n"
" -f, --force force removal of files,\n"
" even if not owned by user\n"
" -h, --help display this help message and exit\n"
" -r, --remove remove home directory and mail spool\n"
"\n"), (E_SUCCESS != status) ? stderr : stdout);
exit (status);
}
/*
* update_groups - delete user from secondary group set
*
* update_groups() takes the user name that was given and searches
* the group files for membership in any group.
*
* we also check to see if they have any groups they own (the same
* name is their user name) and delete them too (only if USERGROUPS_ENAB
* is enabled).
*/
static void update_groups (void)
{
const struct group *grp;
struct group *ngrp;
struct passwd *pwd;
#ifdef SHADOWGRP
bool deleted_user_group = false;
const struct sgrp *sgrp;
struct sgrp *nsgrp;
#endif /* SHADOWGRP */
/*
* Scan through the entire group file looking for the groups that
* the user is a member of.
*/
for (gr_rewind (), grp = gr_next (); NULL != grp; grp = gr_next ()) {
/*
* See if the user specified this group as one of their
* concurrent groups.
*/
if (!is_on_list (grp->gr_mem, user_name)) {
continue;
}
/*
* Delete the username from the list of group members and
* update the group entry to reflect the change.
*/
ngrp = __gr_dup (grp);
if (NULL == ngrp) {
fprintf (stderr,
_("%s: Out of memory. Cannot update %s.\n"),
Prog, gr_dbname ());
exit (13); /* XXX */
}
ngrp->gr_mem = del_list (ngrp->gr_mem, user_name);
if (gr_update (ngrp) == 0) {
fprintf (stderr,
_("%s: failed to prepare the new %s entry '%s'\n"),
Prog, gr_dbname (), ngrp->gr_name);
exit (E_GRP_UPDATE);
}
/*
* Update the DBM group file with the new entry as well.
*/
#ifdef WITH_AUDIT
audit_logger (AUDIT_DEL_USER, Prog,
"deleting user from group",
user_name, (unsigned int) user_id,
SHADOW_AUDIT_SUCCESS);
#endif /* WITH_AUDIT */
SYSLOG ((LOG_INFO, "delete '%s' from group '%s'\n",
user_name, ngrp->gr_name));
}
/*
* we've removed their name from all the groups above, so
* now if they have a group with the same name as their
* user name, with no members, we delete it.
* FIXME: below, the check for grp->gr_mem[0] is not sufficient.
* We should retrieve the group with gr_locate and check
* that gr_mem is empty.
*/
grp = xgetgrnam (user_name);
if ( (NULL != grp)
&& getdef_bool ("USERGROUPS_ENAB")
&& ( (NULL == grp->gr_mem[0])
|| ( (NULL == grp->gr_mem[1])
&& (strcmp (grp->gr_mem[0], user_name) == 0)))) {
pwd = NULL;
if (!fflg) {
/*
* Scan the passwd file to check if this group is still
* used as a primary group.
*/
setpwent ();
while ((pwd = getpwent ()) != NULL) {
if (strcmp (pwd->pw_name, user_name) == 0) {
continue;
}
if (pwd->pw_gid == grp->gr_gid) {
fprintf (stderr,
_("%s: group %s is the primary group of another user and is not removed.\n"),
Prog, grp->gr_name);
break;
}
}
endpwent ();
}
if (NULL == pwd) {
/*
* We can remove this group, it is not the primary
* group of any remaining user.
*/
if (gr_remove (grp->gr_name) == 0) {
fprintf (stderr,
_("%s: cannot remove entry '%s' from %s\n"),
Prog, grp->gr_name, gr_dbname ());
fail_exit (E_GRP_UPDATE);
}
#ifdef SHADOWGRP
deleted_user_group = true;
#endif /* SHADOWGRP */
#ifdef WITH_AUDIT
audit_logger (AUDIT_DEL_GROUP, Prog,
"deleting group",
grp->gr_name, AUDIT_NO_ID,
SHADOW_AUDIT_SUCCESS);
#endif /* WITH_AUDIT */
SYSLOG ((LOG_INFO,
"removed group '%s' owned by '%s'\n",
grp->gr_name, user_name));
}
}
#ifdef SHADOWGRP
if (!is_shadow_grp) {
return;
}
/*
* Scan through the entire shadow group file looking for the groups
* that the user is a member of. Both the administrative list and
* the ordinary membership list is checked.
*/
for (sgr_rewind (), sgrp = sgr_next ();
NULL != sgrp;
sgrp = sgr_next ()) {
bool was_member, was_admin;
/*
* See if the user specified this group as one of their
* concurrent groups.
*/
was_member = is_on_list (sgrp->sg_mem, user_name);
was_admin = is_on_list (sgrp->sg_adm, user_name);
if (!was_member && !was_admin) {
continue;
}
nsgrp = __sgr_dup (sgrp);
if (NULL == nsgrp) {
fprintf (stderr,
_("%s: Out of memory. Cannot update %s.\n"),
Prog, sgr_dbname ());
exit (13); /* XXX */
}
if (was_member) {
nsgrp->sg_mem = del_list (nsgrp->sg_mem, user_name);
}
if (was_admin) {
nsgrp->sg_adm = del_list (nsgrp->sg_adm, user_name);
}
if (sgr_update (nsgrp) == 0) {
fprintf (stderr,
_("%s: failed to prepare the new %s entry '%s'\n"),
Prog, sgr_dbname (), nsgrp->sg_name);
exit (E_GRP_UPDATE);
}
#ifdef WITH_AUDIT
audit_logger (AUDIT_DEL_USER, Prog,
"deleting user from shadow group",
user_name, (unsigned int) user_id,
SHADOW_AUDIT_SUCCESS);
#endif /* WITH_AUDIT */
SYSLOG ((LOG_INFO, "delete '%s' from shadow group '%s'\n",
user_name, nsgrp->sg_name));
}
if ( deleted_user_group
&& (sgr_locate (user_name) != NULL)) {
if (sgr_remove (user_name) == 0) {
fprintf (stderr,
_("%s: cannot remove entry '%s' from %s\n"),
Prog, user_name, sgr_dbname ());
fail_exit (E_GRP_UPDATE);
}
}
#endif /* SHADOWGRP */
}
/*
* close_files - close all of the files that were opened
*
* close_files() closes all of the files that were opened for this
* new user. This causes any modified entries to be written out.
*/
static void close_files (void)
{
if (pw_close () == 0) {
fprintf (stderr, _("%s: failure while writing changes to %s\n"), Prog, pw_dbname ());
SYSLOG ((LOG_ERR, "failure while writing changes to %s", pw_dbname ()));
fail_exit (E_PW_UPDATE);
}
if (pw_unlock () == 0) {
fprintf (stderr, _("%s: failed to unlock %s\n"), Prog, pw_dbname ());
SYSLOG ((LOG_ERR, "failed to unlock %s", pw_dbname ()));
/* continue */
}
pw_locked = false;
if (is_shadow_pwd) {
if (spw_close () == 0) {
fprintf (stderr,
_("%s: failure while writing changes to %s\n"), Prog, spw_dbname ());
SYSLOG ((LOG_ERR, "failure while writing changes to %s", spw_dbname ()));
fail_exit (E_PW_UPDATE);
}
if (spw_unlock () == 0) {
fprintf (stderr, _("%s: failed to unlock %s\n"), Prog, spw_dbname ());
SYSLOG ((LOG_ERR, "failed to unlock %s", spw_dbname ()));
/* continue */
}
spw_locked = false;
}
if (gr_close () == 0) {
fprintf (stderr, _("%s: failure while writing changes to %s\n"), Prog, gr_dbname ());
SYSLOG ((LOG_ERR, "failure while writing changes to %s", gr_dbname ()));
fail_exit (E_GRP_UPDATE);
}
if (gr_unlock () == 0) {
fprintf (stderr, _("%s: failed to unlock %s\n"), Prog, gr_dbname ());
SYSLOG ((LOG_ERR, "failed to unlock %s", gr_dbname ()));
/* continue */
}
gr_locked = false;
#ifdef SHADOWGRP
if (is_shadow_grp) {
if (sgr_close () == 0) {
fprintf (stderr,
_("%s: failure while writing changes to %s\n"), Prog, sgr_dbname ());
SYSLOG ((LOG_ERR, "failure while writing changes to %s", sgr_dbname ()));
fail_exit (E_GRP_UPDATE);
}
if (sgr_unlock () == 0) {
fprintf (stderr, _("%s: failed to unlock %s\n"), Prog, sgr_dbname ());
SYSLOG ((LOG_ERR, "failed to unlock %s", sgr_dbname ()));
/* continue */
}
sgr_locked = false;
}
#endif /* SHADOWGRP */
}
/*
* fail_exit - exit with a failure code after unlocking the files
*/
static void fail_exit (int code)
{
if (pw_locked) {
if (pw_unlock () == 0) {
fprintf (stderr, _("%s: failed to unlock %s\n"), Prog, pw_dbname ());
SYSLOG ((LOG_ERR, "failed to unlock %s", pw_dbname ()));
/* continue */
}
}
if (gr_locked) {
if (gr_unlock () == 0) {
fprintf (stderr, _("%s: failed to unlock %s\n"), Prog, gr_dbname ());
SYSLOG ((LOG_ERR, "failed to unlock %s", gr_dbname ()));
/* continue */
}
}
if (spw_locked) {
if (spw_unlock () == 0) {
fprintf (stderr, _("%s: failed to unlock %s\n"), Prog, spw_dbname ());
SYSLOG ((LOG_ERR, "failed to unlock %s", spw_dbname ()));
/* continue */
}
}
#ifdef SHADOWGRP
if (sgr_locked) {
if (sgr_unlock () == 0) {
fprintf (stderr, _("%s: failed to unlock %s\n"), Prog, sgr_dbname ());
SYSLOG ((LOG_ERR, "failed to unlock %s", sgr_dbname ()));
/* continue */
}
}
#endif /* SHADOWGRP */
#ifdef WITH_AUDIT
audit_logger (AUDIT_DEL_USER, Prog,
"deleting user",
user_name, (unsigned int) user_id,
SHADOW_AUDIT_FAILURE);
#endif /* WITH_AUDIT */
exit (code);
}
/*
* open_files - lock and open the password files
*
* open_files() opens the two password files.
*/
static void open_files (void)
{
if (pw_lock () == 0) {
fprintf (stderr,
_("%s: cannot lock %s; try again later.\n"),
Prog, pw_dbname ());
#ifdef WITH_AUDIT
audit_logger (AUDIT_DEL_USER, Prog,
"locking password file",
user_name, (unsigned int) user_id,
SHADOW_AUDIT_FAILURE);
#endif /* WITH_AUDIT */
fail_exit (E_PW_UPDATE);
}
pw_locked = true;
if (pw_open (O_RDWR) == 0) {
fprintf (stderr,
_("%s: cannot open %s\n"), Prog, pw_dbname ());
#ifdef WITH_AUDIT
audit_logger (AUDIT_DEL_USER, Prog,
"opening password file",
user_name, (unsigned int) user_id,
SHADOW_AUDIT_FAILURE);
#endif /* WITH_AUDIT */
fail_exit (E_PW_UPDATE);
}
if (is_shadow_pwd) {
if (spw_lock () == 0) {
fprintf (stderr,
_("%s: cannot lock %s; try again later.\n"),
Prog, spw_dbname ());
#ifdef WITH_AUDIT
audit_logger (AUDIT_DEL_USER, Prog,
"locking shadow password file",
user_name, (unsigned int) user_id,
SHADOW_AUDIT_FAILURE);
#endif /* WITH_AUDIT */
fail_exit (E_PW_UPDATE);
}
spw_locked = true;
if (spw_open (O_RDWR) == 0) {
fprintf (stderr,
_("%s: cannot open %s\n"),
Prog, spw_dbname ());
#ifdef WITH_AUDIT
audit_logger (AUDIT_DEL_USER, Prog,
"opening shadow password file",
user_name, (unsigned int) user_id,
SHADOW_AUDIT_FAILURE);
#endif /* WITH_AUDIT */
fail_exit (E_PW_UPDATE);
}
}
if (gr_lock () == 0) {
fprintf (stderr,
_("%s: cannot lock %s; try again later.\n"),
Prog, gr_dbname ());
#ifdef WITH_AUDIT
audit_logger (AUDIT_DEL_USER, Prog,
"locking group file",
user_name, (unsigned int) user_id,
SHADOW_AUDIT_FAILURE);
#endif /* WITH_AUDIT */
fail_exit (E_GRP_UPDATE);
}
gr_locked = true;
if (gr_open (O_RDWR) == 0) {
fprintf (stderr, _("%s: cannot open %s\n"), Prog, gr_dbname ());
#ifdef WITH_AUDIT
audit_logger (AUDIT_DEL_USER, Prog,
"opening group file",
user_name, (unsigned int) user_id,
SHADOW_AUDIT_FAILURE);
#endif /* WITH_AUDIT */
fail_exit (E_GRP_UPDATE);
}
#ifdef SHADOWGRP
if (is_shadow_grp) {
if (sgr_lock () == 0) {
fprintf (stderr,
_("%s: cannot lock %s; try again later.\n"),
Prog, sgr_dbname ());
#ifdef WITH_AUDIT
audit_logger (AUDIT_DEL_USER, Prog,
"locking shadow group file",
user_name, (unsigned int) user_id,
SHADOW_AUDIT_FAILURE);
#endif /* WITH_AUDIT */
fail_exit (E_GRP_UPDATE);
}
sgr_locked= true;
if (sgr_open (O_RDWR) == 0) {
fprintf (stderr, _("%s: cannot open %s\n"),
Prog, sgr_dbname ());
#ifdef WITH_AUDIT
audit_logger (AUDIT_DEL_USER, Prog,
"opening shadow group file",
user_name, (unsigned int) user_id,
SHADOW_AUDIT_FAILURE);
#endif /* WITH_AUDIT */
fail_exit (E_GRP_UPDATE);
}
}
#endif /* SHADOWGRP */
}
/*
* update_user - delete the user entries
*
* update_user() deletes the password file entries for this user
* and will update the group entries as required.
*/
static void update_user (void)
{
if (pw_remove (user_name) == 0) {
fprintf (stderr,
_("%s: cannot remove entry '%s' from %s\n"),
Prog, user_name, pw_dbname ());
fail_exit (E_PW_UPDATE);
}
if ( is_shadow_pwd
&& (spw_locate (user_name) != NULL)
&& (spw_remove (user_name) == 0)) {
fprintf (stderr,
_("%s: cannot remove entry '%s' from %s\n"),
Prog, user_name, spw_dbname ());
fail_exit (E_PW_UPDATE);
}
#ifdef WITH_AUDIT
audit_logger (AUDIT_DEL_USER, Prog,
"deleting user entries",
user_name, (unsigned int) user_id,
SHADOW_AUDIT_SUCCESS);
#endif /* WITH_AUDIT */
SYSLOG ((LOG_INFO, "delete user '%s'\n", user_name));
}
/*
* user_cancel - cancel cron and at jobs
*
* user_cancel calls a script for additional cleanups like removal of
* cron, at, or print jobs.
*/
static void user_cancel (const char *user)
{
const char *cmd;
pid_t pid, wpid;
int status;
cmd = getdef_str ("USERDEL_CMD");
if (NULL == cmd) {
return;
}
pid = fork ();
if (pid == 0) {
execl (cmd, cmd, user, (char *) 0);
perror (cmd);
exit (errno == ENOENT ? E_CMD_NOTFOUND : E_CMD_NOEXEC);
} else if ((pid_t)-1 == pid) {
perror ("fork");
return;
}
do {
wpid = wait (&status);
} while ((wpid != pid) && ((pid_t)-1 != wpid));
}
#ifdef EXTRA_CHECK_HOME_DIR
static bool path_prefix (const char *s1, const char *s2)
{
return ( (strncmp (s2, s1, strlen (s1)) == 0)
&& ( ('\0' == s2[strlen (s1)])
|| ('/' == s2[strlen (s1)])));
}
#endif /* EXTRA_CHECK_HOME_DIR */
/*
* is_owner - Check if path is owned by uid
*
* Return
* 1: path exists and is owned by uid
* 0: path is not owned by uid, or a failure occurred
* -1: path does not exist
*/
static int is_owner (uid_t uid, const char *path)
{
struct stat st;
errno = 0;
if (stat (path, &st) != 0) {
if ((ENOENT == errno) || (ENOTDIR == errno)) {
/* The file or directory does not exist */
return -1;
} else {
return 0;
}
}
return (st.st_uid == uid) ? 1 : 0;
}
static int remove_mailbox (void)
{
const char *maildir;
char mailfile[1024];
int i;
int errors = 0;
maildir = getdef_str ("MAIL_DIR");
#ifdef MAIL_SPOOL_DIR
if ((NULL == maildir) && (getdef_str ("MAIL_FILE") == NULL)) {
maildir = MAIL_SPOOL_DIR;
}
#endif /* MAIL_SPOOL_DIR */
if (NULL == maildir) {
return 0;
}
snprintf (mailfile, sizeof mailfile, "%s/%s", maildir, user_name);
if (access (mailfile, F_OK) != 0) {
if (ENOENT == errno) {
fprintf (stderr,
_("%s: %s mail spool (%s) not found\n"),
Prog, user_name, user_home);
return 0;
} else {
fprintf (stderr,
_("%s: warning: can't remove %s: %s\n"),
Prog, mailfile, strerror (errno));
SYSLOG ((LOG_ERR, "Cannot remove %s: %s", mailfile, strerror (errno)));
#ifdef WITH_AUDIT
audit_logger (AUDIT_DEL_USER, Prog,
"deleting mail file",
user_name, (unsigned int) user_id,
SHADOW_AUDIT_FAILURE);
#endif /* WITH_AUDIT */
return -1;
}
}
if (fflg) {
if (unlink (mailfile) != 0) {
fprintf (stderr,
_("%s: warning: can't remove %s: %s\n"),
Prog, mailfile, strerror (errno));
SYSLOG ((LOG_ERR, "Cannot remove %s: %s", mailfile, strerror (errno)));
#ifdef WITH_AUDIT
audit_logger (AUDIT_DEL_USER, Prog,
"deleting mail file",
user_name, (unsigned int) user_id,
SHADOW_AUDIT_FAILURE);
#endif /* WITH_AUDIT */
errors = 1;
/* continue */
}
#ifdef WITH_AUDIT
else
{
audit_logger (AUDIT_DEL_USER, Prog,
"deleting mail file",
user_name, (unsigned int) user_id,
SHADOW_AUDIT_SUCCESS);
}
#endif /* WITH_AUDIT */
return errors;
}
i = is_owner (user_id, mailfile);
if (i == 0) {
fprintf (stderr,
_("%s: %s not owned by %s, not removing\n"),
Prog, mailfile, user_name);
SYSLOG ((LOG_ERR,
"%s not owned by %s, not removed",
mailfile, strerror (errno)));
#ifdef WITH_AUDIT
audit_logger (AUDIT_DEL_USER, Prog,
"deleting mail file",
user_name, (unsigned int) user_id,
SHADOW_AUDIT_FAILURE);
#endif /* WITH_AUDIT */
return 1;
} else if (i == -1) {
return 0; /* mailbox doesn't exist */
}
if (unlink (mailfile) != 0) {
fprintf (stderr,
_("%s: warning: can't remove %s: %s\n"),
Prog, mailfile, strerror (errno));
SYSLOG ((LOG_ERR, "Cannot remove %s: %s", mailfile, strerror (errno)));
#ifdef WITH_AUDIT
audit_logger (AUDIT_DEL_USER, Prog,
"deleting mail file",
user_name, (unsigned int) user_id,
SHADOW_AUDIT_FAILURE);
#endif /* WITH_AUDIT */
errors = 1;
/* continue */
}
#ifdef WITH_AUDIT
else
{
audit_logger (AUDIT_DEL_USER, Prog,
"deleting mail file",
user_name, (unsigned int) user_id,
SHADOW_AUDIT_SUCCESS);
}
#endif /* WITH_AUDIT */
return errors;
}
#ifdef WITH_TCB
static int remove_tcbdir (const char *user_name, uid_t user_id)
{
char *buf;
int ret = 0;
size_t bufsize = (sizeof TCB_DIR) + strlen (user_name) + 2;
if (!getdef_bool ("USE_TCB")) {
return 0;
}
buf = malloc (buflen);
if (NULL == buf) {
fprintf (stderr, _("%s: Can't allocate memory, "
"tcb entry for %s not removed.\n"),
Prog, user_name);
return 1;
}
snprintf (buf, buflen, TCB_DIR "/%s", user_name);
if (shadowtcb_drop_priv () == SHADOWTCB_FAILURE) {
fprintf (stderr, _("%s: Cannot drop privileges: %s\n"),
Prog, strerror (errno));
shadowtcb_gain_priv ();
free (buf);
return 1;
}
/* Only remove directory contents with dropped privileges.
* We will regain them and remove the user's tcb directory afterwards.
*/
if (remove_tree (buf, false) != 0) {
fprintf (stderr, _("%s: Cannot remove the content of %s: %s\n"),
Prog, buf, strerror (errno));
shadowtcb_gain_priv ();
free (buf);
return 1;
}
shadowtcb_gain_priv ();
free (buf);
if (shadowtcb_remove (user_name) == SHADOWTCB_FAILURE) {
fprintf (stderr, _("%s: Cannot remove tcb files for %s: %s\n"),
Prog, user_name, strerror (errno));
ret = 1;
}
return ret;
}
#endif /* WITH_TCB */
/*
* main - userdel command
*/
int main (int argc, char **argv)
{
int errors = 0; /* Error in the removal of the home directory */
#ifdef ACCT_TOOLS_SETUID
#ifdef USE_PAM
pam_handle_t *pamh = NULL;
int retval;
#endif /* USE_PAM */
#endif /* ACCT_TOOLS_SETUID */
#ifdef WITH_AUDIT
audit_help_open ();
#endif /* WITH_AUDIT */
/*
* Get my name so that I can use it to report errors.
*/
Prog = Basename (argv[0]);
(void) setlocale (LC_ALL, "");
(void) bindtextdomain (PACKAGE, LOCALEDIR);
(void) textdomain (PACKAGE);
{
/*
* Parse the command line options.
*/
int c;
static struct option long_options[] = {
{"force", no_argument, NULL, 'f'},
{"help", no_argument, NULL, 'h'},
{"remove", no_argument, NULL, 'r'},
{NULL, 0, NULL, '\0'}
};
while ((c = getopt_long (argc, argv, "fhr",
long_options, NULL)) != -1) {
switch (c) {
case 'f': /* force remove even if not owned by user */
fflg = true;
break;
case 'h':
usage (E_SUCCESS);
break;
case 'r': /* remove home dir and mailbox */
rflg = true;
break;
default:
usage (E_USAGE);
}
}
}
if ((optind + 1) != argc) {
usage (E_USAGE);
}
OPENLOG ("userdel");
#ifdef ACCT_TOOLS_SETUID
#ifdef USE_PAM
{
struct passwd *pampw;
pampw = getpwuid (getuid ()); /* local, no need for xgetpwuid */
if (pampw == NULL) {
fprintf (stderr,
_("%s: Cannot determine your user name.\n"),
Prog);
exit (E_PW_UPDATE);
}
retval = pam_start ("userdel", pampw->pw_name, &conv, &pamh);
}
if (PAM_SUCCESS == retval) {
retval = pam_authenticate (pamh, 0);
}
if (PAM_SUCCESS == retval) {
retval = pam_acct_mgmt (pamh, 0);
}
if (NULL != pamh) {
(void) pam_end (pamh, retval);
}
if (PAM_SUCCESS != retval) {
fprintf (stderr, _("%s: PAM authentication failed\n"), Prog);
exit (E_PW_UPDATE);
}
#endif /* USE_PAM */
#endif /* ACCT_TOOLS_SETUID */
is_shadow_pwd = spw_file_present ();
#ifdef SHADOWGRP
is_shadow_grp = sgr_file_present ();
#endif /* SHADOWGRP */
/*
* Start with a quick check to see if the user exists.
*/
user_name = argv[argc - 1];
{
struct passwd *pwd;
pwd = getpwnam (user_name); /* local, no need for xgetpwnam */
if (NULL == pwd) {
fprintf (stderr, _("%s: user '%s' does not exist\n"),
Prog, user_name);
#ifdef WITH_AUDIT
audit_logger (AUDIT_DEL_USER, Prog,
"deleting user not found",
user_name, AUDIT_NO_ID,
SHADOW_AUDIT_FAILURE);
#endif /* WITH_AUDIT */
exit (E_NOTFOUND);
}
user_id = pwd->pw_uid;
user_home = xstrdup (pwd->pw_dir);
}
#ifdef WITH_TCB
if (shadowtcb_set_user (user_name) == SHADOWTCB_FAILURE) {
exit (E_NOTFOUND);
}
#endif /* WITH_TCB */
#ifdef USE_NIS
/*
* Now make sure it isn't an NIS user.
*/
if (__ispwNIS ()) {
char *nis_domain;
char *nis_master;
fprintf (stderr,
_("%s: user %s is a NIS user\n"), Prog, user_name);
if ( !yp_get_default_domain (&nis_domain)
&& !yp_master (nis_domain, "passwd.byname", &nis_master)) {
fprintf (stderr,
_("%s: %s is the NIS master\n"),
Prog, nis_master);
}
exit (E_NOTFOUND);
}
#endif /* USE_NIS */
/*
* Check to make certain the user isn't logged in.
* Note: This is a best effort basis. The user may log in between,
* a cron job may be started on her behalf, etc.
*/
if (user_busy (user_name, user_id) != 0) {
if (!fflg) {
#ifdef WITH_AUDIT
audit_logger (AUDIT_DEL_USER, Prog,
"deleting user logged in",
user_name, AUDIT_NO_ID,
SHADOW_AUDIT_FAILURE);
#endif /* WITH_AUDIT */
exit (E_USER_BUSY);
}
}
/*
* Do the hard stuff - open the files, create the user entries,
* create the home directory, then close and update the files.
*/
open_files ();
update_user ();
update_groups ();
if (rflg) {
errors += remove_mailbox ();
}
if (rflg) {
int home_owned = is_owner (user_id, user_home);
if (-1 == home_owned) {
fprintf (stderr,
_("%s: %s home directory (%s) not found\n"),
Prog, user_name, user_home);
rflg = 0;
} else if ((0 == home_owned) && !fflg) {
fprintf (stderr,
_("%s: %s not owned by %s, not removing\n"),
Prog, user_home, user_name);
rflg = 0;
errors++;
/* continue */
}
}
#ifdef EXTRA_CHECK_HOME_DIR
/* This may be slow, the above should be good enough. */
if (rflg && !fflg) {
struct passwd *pwd;
/*
* For safety, refuse to remove the home directory if it
* would result in removing some other user's home
* directory. Still not perfect so be careful, but should
* prevent accidents if someone has /home or / as home
* directory... --marekm
*/
setpwent ();
while ((pwd = getpwent ())) {
if (strcmp (pwd->pw_name, user_name) == 0) {
continue;
}
if (path_prefix (user_home, pwd->pw_dir)) {
fprintf (stderr,
_("%s: not removing directory %s (would remove home of user %s)\n"),
Prog, user_home, pwd->pw_name);
rflg = false;
errors++;
/* continue */
break;
}
}
endpwent ();
}
#endif /* EXTRA_CHECK_HOME_DIR */
if (rflg) {
if (remove_tree (user_home, true) != 0) {
fprintf (stderr,
_("%s: error removing directory %s\n"),
Prog, user_home);
errors++;
/* continue */
}
#ifdef WITH_AUDIT
else
{
audit_logger (AUDIT_DEL_USER, Prog,
"deleting home directory",
user_name, (unsigned int) user_id,
SHADOW_AUDIT_SUCCESS);
}
#endif /* WITH_AUDIT */
}
#ifdef WITH_AUDIT
if (0 != errors) {
audit_logger (AUDIT_DEL_USER, Prog,
"deleting home directory",
user_name, AUDIT_NO_ID,
SHADOW_AUDIT_FAILURE);
}
#endif /* WITH_AUDIT */
#ifdef WITH_SELINUX
if (is_selinux_enabled () > 0) {
const char *args[5];
args[0] = "/usr/sbin/semanage";
args[1] = "login";
args[2] = "-d";
args[3] = user_name;
args[4] = NULL;
safe_system (args[0], args, NULL, true);
}
#endif /* WITH_SELINUX */
/*
* Cancel any crontabs or at jobs. Have to do this before we remove
* the entry from /etc/passwd.
*/
user_cancel (user_name);
close_files ();
#ifdef WITH_TCB
errors += remove_tcbdir (user_name, user_id);
#endif /* WITH_TCB */
nscd_flush_cache ("passwd");
nscd_flush_cache ("group");
return ((0 != errors) ? E_HOMEDIR : E_SUCCESS);
}
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